Ventilation facility for vertical shaft spillway tunnel

Abstract

The utility model discloses a ventilation facility for a vertical shaft spillway tunnel, which comprises the vertical shaft spillway tunnel, an annular weir is arranged at the top of the vertical shaft spillway tunnel, and a pressure slope section and a recession tunnel are sequentially arranged on one side of the vertical shaft spillway tunnel towards the downstream. A concrete lining extending to the tail end of the pressure slope section is downwards arranged below the inlet platform along the outer wall of the vertical shaft spillway tunnel, a protection concrete body which is located on one side of the vertical shaft spillway tunnel and extends upwards in the height direction of the vertical shaft spillway tunnel is arranged above the inlet platform, and the protection concrete body is arranged close to the vertical shaft spillway tunnel; the top end of the protective concrete body is higher than an annular weir of the vertical shaft flood discharge tunnel; comprising a ventilation pipe, and the ventilation pipe comprises an underground part arranged in a concrete lining and an overground part arranged in a protective concrete body; one end of the ventilation pipe is communicated with the water recession tunnel, and the other end of the ventilation pipe penetrates through the top end of the protection concrete body. According to the utility model, the construction is convenient, the interference on the construction of the entrance platform is reduced, and the notch groove excavation on the entrance platform and the side slope is avoided.

Description

Technical Field

[0001] The utility model relates to a ventilation facility for a vertical shaft flood discharge tunnel, belonging to the technical field of design of water discharge buildings for water conservancy and hydropower engineering. Background Art

[0002] For some hydropower stations with small catchment areas and small discharge volumes, the probability of flood discharge structures operating is also very small. Especially for the rapidly developing pumped storage power stations, free overflow shaft-type flood discharge tunnels are particularly suitable.

[0003] The water flows overflow from the annular weir of the vertical shaft type spillway and falls into the bottom of the vertical shaft to dissipate energy, and then discharges into the downstream spillway through the drainage tunnel. A pressure slope section is set at the connection between the vertical shaft and the drainage tunnel of the vertical shaft drop-type spillway. The pressure slope section can make the downstream water flow leave the top of the tunnel and keep the drainage tunnel in an open flow state. Ventilation facilities are set at the end of the pressure slope section.

[0004] At present, the ventilation pipe layout of the existing technology is often from the slope pressure section along the outer wall of the shaft to the inlet excavation platform, and then extended along the inlet platform to a certain elevation of the inlet excavation slope. This form of ventilation facility layout has a great interference with the excavation and support construction of the inlet slope, is subject to factors such as the inlet excavation size, geological conditions, construction period, etc., and requires increased project investment. Utility Model Content

[0005] The utility model aims to solve the above technical problems and provide a vertical shaft flood discharge tunnel ventilation facility which avoids the excavation of the inlet platform and the slope groove of the vertical shaft flood discharge tunnel and is convenient to construct.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A ventilation facility for a vertical shaft spillway tunnel comprises a vertical shaft spillway tunnel, wherein a circular weir is arranged at the top of the vertical shaft spillway tunnel, a slope pressure section and a water withdrawal tunnel are arranged in sequence at the downstream side of the vertical shaft spillway tunnel, a concrete lining extending to the end of the slope pressure section is arranged downward along the outer wall of the vertical shaft spillway tunnel below an inlet platform, a protective concrete body extending upward along the height direction of the vertical shaft spillway tunnel and located at the downstream side of the vertical shaft spillway tunnel is arranged above the inlet platform, the protective concrete body is arranged close to the outer wall of the downstream side of the vertical shaft spillway tunnel; the top of the protective concrete body is higher than the height of the circular weir of the vertical shaft spillway tunnel; and further comprises a ventilation pipe, wherein the ventilation pipe comprises an underground part arranged inside the concrete lining and an above-ground part arranged inside the protective concrete body; one end of the ventilation pipe is connected to the water withdrawal tunnel, and the other end of the ventilation pipe passes through the top position of the protective concrete body.

[0008] Therefore, a protective concrete body is set on one side of the vertical shaft spillway tunnel, which not only reduces the construction workload, but also enhances the structural strength of the upper surface of the inlet platform and reduces interference with the construction of the inlet platform; at the same time, the length of the ventilation pipe is reduced, avoiding the need to excavate grooves on the inlet platform and slope of the vertical shaft spillway tunnel to lay the ventilation pipe.

[0009] According to the embodiments of the present invention, the present invention can be further optimized. The following is the technical solution formed after optimization:

[0010] In order not to affect the discharge of the vertical shaft spillway, in a specific embodiment, the protective concrete body includes a first concrete body and a second concrete body arranged on the downstream side of the first concrete body; the first concrete body extends upward from the inlet platform along the height direction of the vertical shaft spillway to the bottom of the circular arc-shaped weir head at the annular weir top; the height of the second concrete body is greater than the height of the first concrete body.

[0011] Specifically, the upstream side of the first concrete body is in close contact with the side wall of the vertical shaft spillway; the downstream side of the second concrete body is arc-shaped. The arc-shaped side wall can make the flow of the annular weir smooth and stable when the vertical shaft drop-flow spillway is discharged, which not only protects the stability of the above-ground part of the ventilation pipe, but also does not affect the original discharge function of the vertical shaft spillway.

[0012] In order to reduce the amount of work and reduce interference with the construction of the import platform, in a specific embodiment, the above-ground part of the ventilation pipe includes an inclined section connected to the underground part and extending upwardly toward one side of the second concrete body, and a vertical section extending vertically upward is provided on the upper part of the inclined section; the vertical section is arranged in the second concrete body.

[0013] In a specific embodiment, the underground portion of the ventilation pipe is arranged close to the concrete lining on the outer side of the downstream side of the vertical shaft flood discharge tunnel, and extends along the top of the slope pressure section to the upstream side of the water withdrawal tunnel.

[0014] In order to enhance the sealing performance of the underground part of the vent pipe, in a specific embodiment, a cushion layer and a water-stopping copper sheet are provided on the outer wall of the vent pipe, and the cushion layer and the water-stopping copper sheet are located at the connection between the vertical shaft flood discharge tunnel and the slope pressure section.

[0015] In a specific embodiment, the diameter of the ventilation pipe is 0.6m~1.0m.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] The ventilation facility of the vertical shaft spillway tunnel of the utility model plays an important role in maintaining the open flow state of the retreat tunnel section of the vertical shaft drop flow type spillway tunnel. The construction is convenient and the interference with the construction of the import platform is reduced. It avoids the excavation of the import platform and the groove of the slope, saves construction time and reduces project investment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the longitudinal section structure of the utility model;

[0019] Figure 2 yes Figure 1 Middle AA section cutaway view;

[0020] Figure 3 yes Figure 1 Middle BB section cutaway view;

[0021] Figure 4 yes Figure 1 Cross-sectional view of the CC section.

[0022] In the figure

[0023] 1-vertical shaft spillway; 11-annular weir; 2-slope pressure section; 3-water withdrawal tunnel; 4-inlet platform; 5-concrete lining; 6-protective concrete body; 61-first concrete body; 62-second concrete body; 7-ventilation pipe; 71-inclined section; 72-vertical section; 8-cushion; 9-water-stop copper sheet. DETAILED DESCRIPTION

[0024] The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict. For the convenience of description, if the words "upper", "lower", "left" and "right" appear in the following text, they only indicate that the upper, lower, left and right directions are consistent with the drawings themselves, and do not limit the structure.

[0025] like Figure 1 As shown, the ventilation facility of the vertical shaft spillway tunnel of this embodiment includes a vertical shaft spillway tunnel 1, the top of the vertical shaft spillway tunnel 1 is provided with an annular weir 11, the side of the vertical shaft spillway tunnel 1 facing downstream is provided with a slope pressure section 2 and a water withdrawal tunnel 3 in sequence, below the inlet platform 4, a concrete lining 5 extending to the end of the slope pressure section 2 is provided downward along the outer wall of the vertical shaft spillway tunnel 1, and above the inlet platform 4, a protective concrete body 6 extending upward along the height direction of the vertical shaft spillway tunnel 1 is provided on one side of the vertical shaft spillway tunnel 1, and the protective concrete body 6 is provided close to the vertical shaft spillway tunnel 1; the top of the protective concrete body 6 is higher than the height of the annular weir 11 of the vertical shaft spillway tunnel 1. The downstream side in this embodiment is the right side of the vertical shaft spillway tunnel 1 in the figure, which is the direction of water flow during flood discharge.

[0026] In order to protect and fix the vent pipe and ensure that the inflow of the annular weir is not affected, the protective concrete body 6 includes a first concrete body 61 and a second concrete body 62 arranged at the downstream side of the first concrete body 61; the first concrete body 61 extends upward from the inlet platform 4 along the height direction of the vertical shaft spillway 1 to the bottom of the circular arc-shaped weir head at the top of the annular weir 11; the height of the second concrete body 62 is greater than the height of the first concrete body 61. The upstream side of the first concrete body 61 is in close contact with the side wall of the vertical shaft spillway 1; the downstream side of the second concrete body 62 is arc-shaped.

[0027] On the plane, the first concrete body 61 on the upstream side of the above-ground ventilation pipe 7 protecting the concrete body 6 is rectangular and connected to the vertical shaft spillway 1, and the outer wall of the second concrete body 62 on the downstream side is a semicircular arc with a diameter equal to the width of the rectangle. The rectangular part of the protective concrete body 6 extends to the bottom of the circular arc weir head on the top of the annular weir, and the semicircular part of the second concrete body 62 on the downstream side extends to the elevation above the check flood level. This design scheme has been verified by hydraulic model tests to ensure that when the concrete structure of the outer wall of the above-ground ventilation pipe is discharged in the vertical shaft drop-flow spillway, the flow state of the annular weir is smooth and stable, and does not affect the discharge of the vertical shaft.

[0028] It also includes a ventilation pipe 7, which includes an underground part arranged inside the concrete lining 5 and an above-ground part arranged inside the protective concrete body 6; one end of the ventilation pipe 7 is connected to the drainage tunnel 3, and the other end of the ventilation pipe 7 passes through the top position of the protective concrete body 6.

[0029] The above-ground portion of the ventilation pipe 7 includes an inclined section 71 connected to the underground portion and extending upwardly and obliquely toward one side of the second concrete body 62 , and a vertical section 72 extending vertically upward is provided on the upper portion of the inclined section 71 ; the vertical section 72 is arranged in the second concrete body 62 .

[0030] The ventilation pipe 7 in this embodiment is a steel pipe, and the underground part of the ventilation pipe 7 is arranged close to the concrete lining 5 on the downstream outer side of the vertical shaft flood discharge tunnel 1 and extends along the top of the slope pressure section 2 to the upstream of the water withdrawal tunnel 3; the above-ground part of the ventilation pipe 7 is inclined upward (biased to the downstream side) to a certain elevation, and then vertically upward and flush with the semicircular arc part of the second concrete body 62 on the downstream side of the ground protection concrete body 6. This solution reduces the interference with the construction of the inlet excavation platform, avoids the excavation of the inlet platform and the slope groove, saves construction time, and reduces project investment.

[0031] In order to ensure smooth ventilation, the diameter of the ventilation pipe 7 in this embodiment is 1.0m, the steel pipe has certain strength and toughness, and is rust-proofed.

[0032] A cushion layer 8 and a water-stop copper sheet 9 are arranged on the outer wall of the ventilation pipe 7, and the cushion layer 8 and the water-stop copper sheet 9 are located at the connection between the vertical shaft flood discharge tunnel 1 and the slope pressure section 2. The cushion layer 8 is a polyurethane cork elastic cushion layer. In this embodiment, the steel pipe wall at the cross-structure joint is wrapped with a polyurethane cork elastic cushion layer 8, which extends a certain distance to both sides of the joint. The elastic modulus of the cushion layer is 2.0MPa. The cushion layer is combined with the anti-corrosion paste on the outside of the steel pipe. In order to prevent the cushion layer from warping, it is tied with a lead wire every 300mm or so.

[0033] The contents explained in the above embodiments should be understood as these embodiments are only used to more clearly illustrate the present invention, and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art fall within the scope defined by the claims attached to this application.

Claims

1. A vertical shaft spillway tunnel ventilation facility, comprising a vertical shaft spillway tunnel (1), wherein a ring weir (11) is arranged at the top of the vertical shaft spillway tunnel (1), a slope pressure section (2) and a water withdrawal tunnel (3) are arranged in sequence on the downstream side of the vertical shaft spillway tunnel (1), and a concrete lining (5) extending to the end of the slope pressure section (2) is arranged downward along the outer wall of the vertical shaft spillway tunnel (1) below an inlet platform (4), characterized in that: A protective concrete body is arranged above the inlet platform (4) and is located at the downstream side of the vertical shaft spillway (1) and extends upward in the height direction of the vertical shaft spillway (1); the protective concrete body (6) is arranged close to the vertical shaft spillway (1); the top of the protective concrete body (6) is higher than the height of the annular weir (11) of the vertical shaft spillway (1); It also includes a ventilation pipe (7), the ventilation pipe (7) including an underground portion arranged inside the concrete lining (5) and an above-ground portion arranged inside the protective concrete body (6); one end of the ventilation pipe (7) is connected to the drainage tunnel (3), and the other end of the ventilation pipe (7) passes through the top end of the protective concrete body (6).

2. The vertical shaft flood discharge tunnel ventilation facility according to claim 1 is characterized in that: The protective concrete body (6) comprises a first concrete body (61) and a second concrete body (62) arranged on the downstream side of the first concrete body (61); the first concrete body (61) extends upward from the inlet platform (4) along the height direction of the vertical shaft spillway (1) to the bottom of the circular arc-shaped weir head at the top of the annular weir (11); the height of the second concrete body (62) is greater than the height of the first concrete body (61).

3. The vertical shaft flood discharge tunnel ventilation facility according to claim 2 is characterized in that: The upstream side of the first concrete body (61) is in close contact with the side wall of the vertical shaft flood discharge tunnel (1); and the downstream side of the second concrete body (62) is arc-shaped.

4. The vertical shaft flood discharge tunnel ventilation facility according to any one of claims 2-3, characterized in that: The above-ground portion of the ventilation pipe (7) comprises an inclined section (71) connected to the underground portion and extending obliquely upward toward one side of the second concrete body (62); a vertical section (72) extending vertically upward is provided on the upper portion of the inclined section (71); and the vertical section (72) is provided in the second concrete body (62).

5. The vertical shaft flood discharge tunnel ventilation facility according to any one of claims 2-3, characterized in that: The underground part of the ventilation pipe (7) is arranged in close proximity to the concrete lining (5) on the outer side of the downstream side of the vertical shaft spillway (1), and extends along the top of the slope pressure section (2) to the upstream side of the water withdrawal tunnel (3).

6. The vertical shaft flood discharge tunnel ventilation facility according to claim 1, characterized in that: A cushion layer (8) and a water-stop copper sheet (9) are provided on the outer wall of the ventilation pipe (7), and the cushion layer (8) and the water-stop copper sheet (9) are located at the connection between the vertical shaft flood discharge tunnel (1) and the slope pressure section (2).

7. The vertical shaft flood discharge tunnel ventilation facility according to claim 1 is characterized in that: The diameter of the ventilation pipe (7) is 0.6 m to 1.0 m.

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